A man was taken to Northampton General Hospital following a collision on the M1 near to Watford Gap.
The accident happened southbound on the motorway at 4.45pm on Friday January 2. It involved a blue Jaguar XF being driven by a 48-year-old man and a maroon DAF HGV being driven by a 53-year-old man.
Police say the man driving the Jaguar suffered a suspected medical episode at the wheel which resulted in the collision. He was taken to Northampton General Hospital for treatment.
Police would like to speak to anyone who may have witnessed this collision or who may have any information regarding it.
Anyone with information or who witnessed this incident is asked to call the Drivewatch Hotline on 0800 174615.